Construct a parting surface
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Choose Surfacing tab→Surfacing group→Split list→Parting Surface
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Select a planar face or reference plane that is parallel to the direction you want the parting surface.
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Select a curve.
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Type the surface width you want, then position the cursor in the direction that you want the parting surface and click.
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Click Finish.
 
Tip: 
               The curve you select can be open or closed. When selecting more than one curve, the curves must be end-point connected.
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